Concept explainers
(a)
To determine: The number of different kinds of protons present in toluene.
Interpretation: The number of different kinds of protons present in toluene is to be determined.
Concept introduction: The chemical shift is defined as the difference in parts per million in the absorption spectrum of a particular proton from the absorption position of a reference proton. Tetramethylsilane is taken as the reference proton. Chemical shifts are measured in parts per million and it is a dimensionless quantity.
(b)
To explain: The reason as to why the aromatic region around
Interpretation: The reason as to why the aromatic region around
Concept introduction: The chemical shift is defined as the difference in parts per million in the absorption spectrum of a particular proton from the absorption position of a reference proton. Tetramethylsilane is taken as the reference proton. Chemical shifts are measured in parts per million and it is a dimensionless quantity.
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Organic Chemistry (9th Edition)
- Aspirin has several significant peaks in the FTIR. Match the most significant peaks below (in wavenumbers, cm ¹) with the bond to which the peak corresponds. HO₂C. 3100 (Broad) 1765 1690 1200 H₂C 2950 3050 C-H (sp2-carbon) C=O (ester) C=O (carboxylic acid) C-O O-H C-H (sp3-carbon) → + + + → →arrow_forwardWhy do aldehydes, esters, and amides all have a strong absorption in the 1630-1780 cm1 region of their IR spectra? A) The bond between H and the sp³-hybridized C in these functional groups vibrates in this energy range. B) Each of these functional groups has at least two resonance structures, and the different vibrations of the resonance structures give off energy in this region. C) The bond between O and the sp²-hybridized C in these functional groups vibrates at a frequency in this energy range. D) Light at this wavenumber causes the average C to O bond length to increase which causes more of this light to be transmitted. E) An electron in the bond of these functional groups gets excited to the * orbital.arrow_forwardBb Microsoft PowerPoi X A molecule with the molecular formula of CsH10O produces the IR spectrum shown below. Draw a structure that best fits this data. Bb Microsoft Pow X ← → с app.101edu.co ← Microsoft PowerPoi X Bb Microsoft PowerPoi X 3000 Microsoft Pow X app.101edu.co 3000 2000 [a] A molecule with the molecular formula of C7HBO produces the IR spectrum shown below. Draw a structure that best fits this data. Wavnumbers") Bb Microsoft Pow: X Nucleophilic Substi X Nucleophilic: Problem 22 of 16 X Aktiv Chemistry Atoms, Bonds and Rings Draw or tap a new bond to see suggestions. Aktiv Chemistr X Problem 24 of 16 Atoms, Bonds and Rings Charges X b Search results X Charges C Post a new questio Ⓒo X CA molecule wi X + + B Undo Remove Undo Remove ★ I Reset Ⓒ Done Reset * ☐ Ⓒ Done T Drag To Pan x Submit ⠀ ★ T I Drag To Pan F Submitarrow_forward
- How do the following factors affect absorption frequencies? O-H vs O-D. CH stretch, hybrid orbitals used by carbonarrow_forwardThe IR spectra of nonane (C,H20) and 1-hexanol (C,H13OH) are shown below. Assign each spectrum to the correct compound and identify the frequencies and the functional groups used to support your assignment. λ (μη) 6 7 8 9 10 11 12 1314 15 2.5 100 3 5 20 4 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm¬') A (µm) 2.5 100 8 9 10 11 12 13 14 15 3 4 5 7 20 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm¬!) (%) Transmission (%) Transmissionarrow_forward11. Predict the number of signals expected in the 13C spectrum of a. 1-bromo-2-chlorobenzene b. 1-bromo-4-chlorobenzenearrow_forward
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- Figure 1.9: The structure of this acid (C5H10O2) is: 4 singlet triplet 3 doublet 3 n=8 Figure 3: ¹H-NMR of unknown ether C (molecular formula C5H12O). Figure 1.10: The structure of this ether (C5H10O2) is: Figure 1.11: The structure of this compound (C7H16) is: мий doublet n=8 ми ми doublet triplet 1arrow_forward¹H-NMR Spectra 3 M.F. = C₂H₁3NO 1 S 10 -00 8 6 PPM 4 N 21 3 ſ 2[2] -~ 2 3 jarrow_forward4. Why does a carbon to oxygen double bond absorption band have a greater intensity than a carbon to carbon double bond absorption band?arrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning